减压井机械淤堵机制与防治方法试验研究

探讨了长江堤防减压井由于设计、施工及运行环境等因素对其产生机械淤堵的影响，研究了不同渗流介质的渗透特性以及多种介质不同组合的综合特性。除传统试验外，自行研制了径向渗透试验模型装置，采用几种物理试验方式配合，对包括地层、反滤层、滤网和井管组成的整个减压井系统，以及径向的水流与几何条件进行模拟试验。通过对室内试验与现场测试成果的综合分析，对减压井机械淤堵机制和淤堵判定进行了归纳，针对实际水动力条件和运行模式，提出了减压井反滤系统防止机械淤堵的优化设计理念。

Research on mechanical clogging mechanism of releaf well and its control method

In order to investigate the influences of design, construction and operation conditions of relief well on its clogging, a series of seepage tests have been carried out for studying the related materials as well as their combinations. Besides conventional seepage tests, a special radial model test device has been developed to simulate site circumstance of groundwater movement around relief well. The possible varieties of foundation sand, gravel filter, plastic screen, removable polyurethane foam filter and inner tube are taken into account respectively or as a whole drainage system. Through the comprehensive analysis of tests both in laboratory and in situ, the mechanical clogging mechanism and its control are summarized. In view of actual hydrodynamic circumstances and operation conditions in Yangtze River dikes, an optimized filter system design for relief wells has been proposed.